Low pathogenic avian influenza (poultry),
United States of America
Information received on 24/07/2020 from Dr Mark Davidson, Associate Administrator, USDA-APHIS, United States Department of Agriculture, Washington, United States of America
Report type Follow-up report No. 10 (Final report)
Date of start of the event 10/03/2020
Date of confirmation of the event 12/03/2020
Report date 24/07/2020
Date submitted to OIE 24/07/2020
Date event resolved 21/07/2020
Reason for notification Recurrence of a listed disease
Date of previous occurrence 30/08/2019
Manifestation of disease Clinical disease
Causal agent Low pathogenic avian influenza virus
Serotype H7N3
Nature of diagnosis Laboratory (advanced)
This event pertains to a defined zone within the country
Related reports Immediate notification (16/03/2020)
Follow-up report No. 1 (24/03/2020)
Follow-up report No. 2 (06/04/2020)
Follow-up report No. 3 (14/04/2020)
Follow-up report No. 4 (27/04/2020)
Follow-up report No. 5 (07/05/2020)
Follow-up report No. 6 (18/05/2020)
Follow-up report No. 7 (21/05/2020)
Follow-up report No. 8 (05/06/2020)
Follow-up report No. 9 (26/06/2020)
Follow-up report No. 10 (24/07/2020)
Outbreaks There are no new outbreaks in this report
Source of the outbreak(s) or origin of infection
  • Unknown or inconclusive
Epidemiological comments 24 Jul 2020 Update--The USDA Animal and Plant Health Inspection Service (APHIS); South Carolina State Veterinarian’s Office, part of Clemson University Livestock Poultry Health (CULPH); and the North Carolina Department of Agriculture and Consumer Services (NCDA&CS) responded swiftly to the detection of H7N3 LPAI and conducted a comprehensive epidemiological investigation of this event. In addition to having no further LPAI detections, the States of South Carolina (SC) and North Carolina (NC) have met the following: •Completed mandatory enhanced surveillance and all surveillance samples have tested negative for avian influenza virus. •Completed the depopulation of all affected premises and completed the appropriate disposal of birds and material. •Completed cleaning and disinfection/virus elimination of all affected premises. Routine passive and active surveillance for the National Poultry Improvement Plan (NPIP) avian influenza programs is ongoing state-wide in SC and NC with negative results. The State Veterinarians of SC and NC have released quarantines on all affected premises in Chesterfield, Anson and Union Counties. The H7N3 LPAI event in SC and NC is now final, closed and resolved.
Control measures
Measures applied
  • Disinfection
  • Zoning
  • Stamping out
  • Quarantine
  • Surveillance within containment and/or protection zone
  • Movement control inside the country
  • Vaccination prohibited
  • No treatment of affected animals
Measures to be applied
  • No other measures
Future Reporting
The event is resolved. No more reports will be submitted.